<template>
  <div>
    <el-container>
      <!-- 侧边栏-->
      <el-aside :style="{ width: isCollapse ? '64px' : '200px', minHeight: '100vh', backgroundColor: '#001529' }">
        <div style="height: 60px; line-height: 60px; background-color: lightslategray; color: white; display: flex; align-items: center; justify-content: center;">
          <img src="@/assets/tushu.png" alt="" width="60px" height="60px">
        </div>
        <!-- 菜单栏-->
        <el-menu
          default-active="2"
          class="el-menu-vertical-demo"
          @open="handleOpen"
          @close="handleClose"
          background-color="#545c64"
          text-color="#fff"
          :collapse="isCollapse"
          :collapse-transition="false"
        >
          <el-submenu index="1">
            <template slot="title">
              <i class="el-icon-location"></i>
              <span>导航一</span>
            </template>
            <el-menu-item-group>
              <template slot="title">分组一</template>
              <el-menu-item index="1-1">选项1</el-menu-item>
              <el-menu-item index="1-2">选项2</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="分组2">
              <el-menu-item index="1-3">选项3</el-menu-item>
            </el-menu-item-group>
            <el-submenu index="1-4">
              <template slot="title">选项4</template>
              <el-menu-item index="1-4-1">选项1</el-menu-item>
            </el-submenu>
          </el-submenu>
          <el-menu-item index="2">
            <i class="el-icon-menu"></i>
            <span slot="title">导航二</span>
          </el-menu-item>
          <el-menu-item index="3" disabled>
            <i class="el-icon-document"></i>
            <span slot="title">导航三</span>
          </el-menu-item>
          <el-menu-item index="4">
            <i class="el-icon-setting"></i>
            <span slot="title">导航四</span>
          </el-menu-item>
        </el-menu>
      </el-aside>

      <!-- 头部区域-->
      <el-container>
        <el-header>
          <i class="el-icon-menu" style="cursor: pointer; width: 40px; margin-top: 20px" @click="handleCollapse"></i>
        </el-header>
        <!-- 主体区域-->
        <el-main>
          主体区域
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  name: 'HomeView',
  data() {
    return {
      isCollapse: false // 默认不收缩
    }
  },
  methods: {
    handleCollapse() {
      this.isCollapse = !this.isCollapse
    }
  }
}
</script>

<style scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 100%;
}
.el-aside{
  transition: width.3s;
}
/* 3s延迟收缩变换 */
</style>
